<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="jquery-3.2.1.min.js"></script>
    <script>
        $(function () {
            var k = 0;
            // 在被选中元素之后插入内容；
            $('#btn').on('click',function () {
                k++
                $('p').append(',this is fuck'+k)
            })
        })
    </script>
</head>
<body>
<p> Hello </p>
<button id="btn">click</button>
</body>
</html>